Quote:
Originally Posted by coptica
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what is the timing chain service?
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may I direct your attention to this 60-page (and still growing) epic:
https://f30.bimmerpost.com/forums/sh....php?t=1614899
A few more pages and it will need to be registered with the Library of Congress...
short answer - replace timing chain & guides, sprockets, tensioner, oil pump drive module, to prevent sudden loss of timing (which can sometimes, though not always, translate to sudden loss of engine)